Digital Image Processing (using Java)

public static int clamp(float value) {}return Math.min(Math.max(Math.round(value), 0), 255);ROI (region of interest)Java MeanROI matthead.pngLISTING 5.13 Example of using a ROI in the calculation of mean grey level.public double meanValue(BufferedImage img) {Raster raster = img.getRaster();double sum = 0.0;for (int y = 0; y < img.getHeight(); ++y)for (int x = 0; x < img.getWidth(); ++x)sum += raster.getSample(x, y, 0);return sum / (img.getWidth()*img.getHeight());}public double meanValue(BufferedImage img, Rectangle region) {return meanValue(img.getSubimage(region.x, region.y,region.width, region.height));}(p.97)LISTING 5.14 Java code to enlarge an image by pixel replication.public static BufferedImage enlarge (BufferedImage image, int n ){int w = n*image.getWidth();int h = n*image.getHeight();BufferedImage enlargedImage = new BufferedImage(w, h, image.getType());for (int y = 0; y < h; ++y)for (int x=0; x < w; ++x)enlargedImage.setRGB(x, y, image.getRGB(x/n, y/n));}return enlargedImage;LISTING 5.15 Java code to shrink an image by skipping pixels.- 17 -